Nobody was around at the time of day you chose. If the channel is generally quiet, come back later.

You're asking a question which nobody knows the answer to, or which requires a lot of work to answer.

You're asking a question which is in the FAQ, the help, the manual, or other documentation, and the volunteers in the channel feel it would be best if you found it yourself.

Questions relating to problems with your particular installation of MediaWiki are generally best answered on IRC, since they often require a back-and-forth exchange to isolate the problem, which is tedious when performed on the mailing lists.